3. pp Annihilation _ Gluon- Rich Environment
Direct resonant formation of states with
all non-exotic quantum numbers.
⟹ excellent precision in mass and
width measurement
Access to both exotic
and non-exotic quantum
numbers via production
and formation reactions
Versatility of physics program
(if coupled to universal detector) _
Uniqueness of p probe
(no other p facility in this energy range in the world) _

4. PANDA Physics Program HADRON SPECTROSCOPY CHARMONIUM
GLUONIC EXCITATIONS
OPEN CHARM
(MULTI)STRANGE BARYONS
NUCLEON STRUCTURE
ELECTROMAGNETIC FORM FACTORS
TMDs
GPDs, TDAs
HYPERNUCLEAR PHYSICS
HADRONS IN THE NUCLEAR MEDIUM
ArXiV:

5. Baryon Spectroscopy Prospects for PANDA S=2 hyperons (Ξ)
New baryon states ?
Properties of already known states.
Symmetries in observed spectrum.
Prospects for PANDA
S=2 hyperons (Ξ)
S=0 baryons (N)
S=1 hyperons (Λ)
Baryons in PANDA
Large cross section s for pp → YY
pp → ΞΞ ≈ μb
pp → ΩΩ ≈ ÷ 0.06 μb
No extra mesons in final state
needed for strangeness or charm
conservation
Symmetry in hyperon and antihyperon
PANDA detector versatile
S=3 hyperons (Ω)
Charmed (Λc, Σc,Pc)
Hidden charm (Ncc)
PANDA is a
Strangeness Factory

6. Open Questions Missing resonances Wrong masses, wrong sequence
Relevant degrees of freedom?
3-quark or quark-diquark structure?
single particle excitation modes
meson-baryon dynamics

7. Excited Hyperon States?
U. Löring, B.Ch. Metsch, H.R. Petry,
Eur. Phys. J A 10 (2001) 309, 395,447
W* : 0 ****
X* : 1 ****
L* : 8 ****
S* : 5 ****
N* : 10 ****
D : 7 ****

8. SU(6) x O(3) Classification
PDG:
octet X states: no partner states of most known N* states
X(1820) and X(2030) “educated guess”
decuplet X and W states: no D* partner state
note on X resonances: “… nothing of significance on X resonances has been added since our 1988 edition.”

9. J = 3/2
J = 5/2
Data on Ξ States: Ξ(1530)
The only reasonably well studied Ξ resonance:
Ξ(1530) - decuplet g.s JP = 3/2+
Г = 9…10 MeV
decay: ~100% Ξπ
BaBar measured the Ξ(1530)0 spin J = 3/2 in Λc+  Ξ- π+ K+
Compare to Δ!!
BaBar 2008
B. Aubert et al.,
PRD 78 (2008)

10. Why Study Excited Baryons with PANDA?_ _
Large cross sections for p p  B B*
σ(pp  ΞΞ) ≈ μb
σ(pp  ΩΩ) ≈ 0.03 … 0.1 μb (prediction)
No extra mesons to balance strangeness or charm
Symmetry in baryon and antibaryon observables
Capabilities of the PANDA detector
PANDA is unique in baryon spectroscopy beyond nucleon and Δ !! _ _ _ _

11. Physics Subtopics: List of physics subtopics: Study excited states of
double-strange hyperons ( Ξ ∗ )
triple-strange hyperons ( Ω ∗ )
charmed hyperons ( Λ 𝑐 ∗ , Σ 𝑐 ∗ )
hidden-charm nucleons ( 𝑁 𝑐 𝑐 )
non-strange baryons ( 𝑁 ∗ )
single-strange hyperons ( Λ ∗ , Σ ∗ )
Comes as by-product
Identify specific issues

12. PANDA Physics Book: Ξ*  Ξπ_
PANDA Physics Book: Ξ*  Ξπ
characteristic event topology
σ ~ μb: ~107 Ξ /d produced
final states to be studied: Ξ*  Ξ π, Ξ η, Λ K, Σ K, Ξ(1530) π, Ξ π π, …
benchmark channel: GeV/c p p  Ξ- Ξ+ π0
no empty regions or discontinuities in Dalitz plot
Ξ-π0 mass resolution < 4 MeV; rec. eff. ~15%, S/B >19*
*DPM generated background _

13. _ _ Simulation of pp  Ξ+Ξ- p = 4 GeV/c
Pandaroot versions: scrut14 (2×105 events), oct14 (106 events)
Analysis in progress
Specific issues:
ideal reco for displaced vertices
no vertex fitter yet for Ξ  Λπ
reduced efficiency for p as compared to p
Multiple tracks for same MC index
Λ mass spectrum after vertex fit _

14. p [GeV/c]
θ [o]

15. ΞΞ eff.: ~14% _
M [GeV/c2]

16. z [cm]

17. Status of HESR and the PANDA Detector

18. HESR
PANDA
Electron cooler
Stochastic cooling
Kicker PU

19. HESR is on time and on budget
Status of HESR
9 of 46 dipoles delivered to FZJ (final one in Q2/2017)
10 of 84 quadrupoles delivered (final one in Q2/2017)
Dipole PoCos specified,will be ordered when supply building completed
Quad. Power Converters (PoCo) delivered
PANDA Chicane dipole PoCo delivered
RF and Stochastic Cooling: 1st tanks in 2015
HESR is on time and on budget

20. All PANDA Systems
13 m

21. Rate Estimates for Hyperon Production

22. Potential Run-Plan – Overview first 2 years
χc2 angular distribution
X(3872) scan
survey light and heavy exotics generic open charm production
1.64
2.0
3.0
15.0
12.0
8.0
7.0
3.75
4.4
5.75
5.55
GeV/c
ΩΩbar and ΛcΛcbar production and dynamics
excited Ωs generic open and hidden charm production
length of run
ΔΔ content of the deuteron – feasibility of pbard meson spectroscopy
χc1 ang. distr. and excited Ξs
ΞΞbar production and dynamics
Y(2175) and ΦΦ - T/PS-glueball search
Ξ-Atoms and excited Λs
pbar and Λbar-potentials (N, Ne, Ar targets)
time-like form-factors - meson spectroscopy -ΛΛbar physics

23. Summary/Conclusions 
Many open questions on how complex structures are derived from underlying degrees of freedom
Antiprotons provide precision measurements
Broad/fascinating physics program at PANDA
High cross sections for baryon-antibaryon pairs
Accelerator on-time and on-budget
Detector proceeding swiftly 

24. The PANDA Collaboration
~ 520 Members, 69 Institutes, 18 Countries Austria, Australia, Belarus, China, France, Germany, India, Italy, Poland, Romania, Russia, Spain, Sweden, Switzerland, Thailand, Netherlands, USA, UK